:root {
  --bg: #0e0e12;
  --panel: #1a1a22;
  --text: #f5f5f7;
  --muted: #8a8a96;
  --work: #22c55e;
  --rest: #ef4444;
  --ready: #3b82f6;
  --done: #a855f7;
  --accent: #facc15;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  -webkit-tap-highlight-color: transparent;
}
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
header {
  padding: 16px 20px;
  text-align: center;
  border-bottom: 1px solid #27272f;
}
header h1 {
  margin: 0;
  font-size: 18px;
  letter-spacing: 1px;
  color: var(--muted);
  font-weight: 500;
}
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  gap: 20px;
}
.timer-screen {
  width: 100%;
  max-width: 380px;
  aspect-ratio: 1;
  border-radius: 24px;
  background: var(--panel);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  transition: background-color 0.3s ease;
  text-align: center;
}
.timer-screen.work { background: var(--work); }
.timer-screen.rest { background: var(--rest); }
.timer-screen.ready { background: var(--ready); }
.timer-screen.done { background: var(--done); }
.phase {
  font-size: 22px;
  text-transform: uppercase;
  letter-spacing: 4px;
  margin-bottom: 8px;
  opacity: 0.9;
}
.countdown {
  font-size: clamp(48px, 14vw, 96px);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.exercise-anim {
  position: relative;
  width: clamp(80px, 16vw, 130px);
  height: clamp(80px, 16vw, 130px);
  margin: 8px auto 0;
  color: rgba(255, 255, 255, 0.95);
  --skin: #f0c098;
  --hair: #2a1a0e;
  --shirt: #1d4ed8;
  --shorts: #1f2937;
}
.exercise-anim.coach-female {
  --hair: #6b3410;
  --shirt: #db2777;
}
.exercise-anim.coach-male {
  --hair: #2a1a0e;
  --shirt: #1d4ed8;
}
.exercise-anim:empty { display: none; }
.ex-anim {
  position: relative;
  width: 100%;
  height: 100%;
}
.ex-anim svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}
.ex-pushup svg { animation: anim-push 0.85s ease-in-out infinite alternate; }
@keyframes anim-push {
  from { transform: translateY(-3px); }
  to   { transform: translateY(7px); }
}
.ex-squat svg { animation: anim-squat 0.85s ease-in-out infinite alternate; transform-origin: 50% 100%; }
@keyframes anim-squat {
  from { transform: translateY(0) scaleY(1); }
  to   { transform: translateY(6px) scaleY(0.86); }
}
.ex-jumpsquat svg { animation: anim-jsquat 0.75s ease-in-out infinite; transform-origin: 50% 100%; }
@keyframes anim-jsquat {
  0%   { transform: translateY(0) scaleY(1); }
  30%  { transform: translateY(7px) scaleY(0.78); }
  60%  { transform: translateY(-12px) scaleY(1.08); }
  100% { transform: translateY(0) scaleY(1); }
}
.ex-plank svg { animation: anim-breathe 2s ease-in-out infinite alternate; transform-origin: center; }
@keyframes anim-breathe {
  from { transform: scale(1); }
  to   { transform: scale(1.04); }
}
.two-state .state-a { animation: state-a var(--dur, 0.6s) steps(1) infinite; }
.two-state .state-b { animation: state-b var(--dur, 0.6s) steps(1) infinite; opacity: 0; }
@keyframes state-a { 0%, 49.9% { opacity: 1; } 50%, 100% { opacity: 0; } }
@keyframes state-b { 0%, 49.9% { opacity: 0; } 50%, 100% { opacity: 1; } }
.ex-mountain { --dur: 0.4s; }
.ex-jjack    { --dur: 0.5s; }
.ex-lunge    { --dur: 0.8s; }
.ex-burpee   { --dur: 0.8s; }
.ex-crunch   { --dur: 0.7s; }
.ex-default  { --dur: 0.4s; }
.coach-male .hair-only-f { display: none; }
.coach-female .hair-only-m { display: none; }
.stepper {
  display: flex;
  align-items: center;
  gap: 6px;
}
.stepper input[type="number"] {
  width: 52px;
  text-align: center;
  -moz-appearance: textfield;
}
.stepper input[type="number"]::-webkit-outer-spin-button,
.stepper input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
}
.stepper button {
  min-width: 36px;
  padding: 8px;
  font-size: 18px;
  line-height: 1;
}
.coach-toggle { display: flex; gap: 6px; }
.coach-toggle button {
  background: #0e0e12;
  border: 1px solid #2f2f3a;
  border-radius: 8px;
  padding: 8px 14px;
  min-width: 80px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
}
.coach-toggle button.active {
  background: var(--accent);
  color: #1a1a22;
  border-color: var(--accent);
}
.exercise {
  margin-top: 8px;
  font-size: clamp(20px, 4vw, 32px);
  font-weight: 600;
  min-height: 1.4em;
}
.next-up {
  margin-top: 16px;
  font-size: 14px;
  opacity: 0.85;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.round-info {
  margin-top: 8px;
  font-size: 16px;
  opacity: 0.85;
}
.controls {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
button {
  background: var(--panel);
  color: var(--text);
  border: 1px solid #2f2f3a;
  border-radius: 12px;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  min-width: 110px;
  transition: transform 0.05s, background 0.2s;
}
button:hover { background: #25252f; }
button:active { transform: scale(0.97); }
button.primary {
  background: var(--accent);
  color: #1a1a22;
  border-color: var(--accent);
}
button.primary:hover { background: #fde047; }
.config {
  width: 100%;
  max-width: 600px;
  background: var(--panel);
  border-radius: 16px;
  padding: 20px;
  display: grid;
  gap: 14px;
}
.config h2 {
  margin: 0 0 4px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--muted);
}
.row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
}
.row label {
  font-size: 15px;
  color: var(--text);
}
.row input[type="number"] {
  width: 90px;
  background: #0e0e12;
  color: var(--text);
  border: 1px solid #2f2f3a;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 16px;
  text-align: right;
}
textarea {
  width: 100%;
  min-height: 110px;
  background: #0e0e12;
  color: var(--text);
  border: 1px solid #2f2f3a;
  border-radius: 8px;
  padding: 10px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
}
.hint {
  font-size: 12px;
  color: var(--muted);
}
footer {
  text-align: center;
  padding: 12px;
  color: var(--muted);
  font-size: 12px;
}